Well I've read it yoly, I'm afraid most of it was beyond my aging brain cells. However I did glean this from it:-
"No causal relationship between obesity and diabetes mellitus was shown in this study."
And also the GTT isn't good enough to determine a diabetic diagnosis on its own.
"Since a significant number of patients with normal glucose tolerances were shown to have diabetes mellitus in situ, the reliability of the glucose tolerance test alone as a means of assessing presence or absence of disease must be re-evaluated. "